CVE-2026-18436: CWE-862 Missing Authorization in mailerpress MailerPress – Newsletter, email marketing & AI automation
The MailPress plugin for WordPress is vulnerable to unauthorized access in versions up to, and including, 1.5.0 via the campaign revision-restore REST endpoint (POST /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revision_id>). The route in the vulnerable range was registered without a permissionCallback, allowing the restoreRevision() handler to run for unauthenticated requests and overwrite a campaign's content_html with any prior revision. This makes it possible for unauthenticated attackers to modify campaign content by restoring an arbitrary revision.
AI Analysis
Technical Summary
CVE-2026-18436 is a missing authorization vulnerability (CWE-862) in the MailerPress WordPress plugin (up to version 1.5.0). The REST API endpoint POST /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revision_id> is registered without a permissionCallback, allowing unauthenticated users to invoke the restoreRevision() function. This enables attackers to overwrite a campaign's content_html by restoring any previous revision, effectively modifying campaign content without authentication.
Potential Impact
An unauthenticated attacker can modify the content of email marketing campaigns by restoring arbitrary prior revisions. This can lead to unauthorized content changes in campaigns sent to subscribers. The vulnerability does not impact confidentiality or availability but affects integrity of campaign content. The CVSS 3.1 base score is 5.3 (medium severity), reflecting network attack vector, low complexity, no privileges required, no user interaction, and impact limited to integrity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the REST API endpoints if possible or disable the MailerPress plugin if not in use. Monitor vendor channels for updates and apply patches promptly once released.
CVE-2026-18436: CWE-862 Missing Authorization in mailerpress MailerPress – Newsletter, email marketing & AI automation
Description
The MailPress plugin for WordPress is vulnerable to unauthorized access in versions up to, and including, 1.5.0 via the campaign revision-restore REST endpoint (POST /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revision_id>). The route in the vulnerable range was registered without a permissionCallback, allowing the restoreRevision() handler to run for unauthenticated requests and overwrite a campaign's content_html with any prior revision. This makes it possible for unauthenticated attackers to modify campaign content by restoring an arbitrary revision.
CVSS v3.1
Score 5.3medium
Affected software
mailerpress
MailerPress – Newsletter, email marketing & AI automation
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-18436 is a missing authorization vulnerability (CWE-862) in the MailerPress WordPress plugin (up to version 1.5.0). The REST API endpoint POST /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revision_id> is registered without a permissionCallback, allowing unauthenticated users to invoke the restoreRevision() function. This enables attackers to overwrite a campaign's content_html by restoring any previous revision, effectively modifying campaign content without authentication.
Potential Impact
An unauthenticated attacker can modify the content of email marketing campaigns by restoring arbitrary prior revisions. This can lead to unauthorized content changes in campaigns sent to subscribers. The vulnerability does not impact confidentiality or availability but affects integrity of campaign content. The CVSS 3.1 base score is 5.3 (medium severity), reflecting network attack vector, low complexity, no privileges required, no user interaction, and impact limited to integrity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the REST API endpoints if possible or disable the MailerPress plugin if not in use. Monitor vendor channels for updates and apply patches promptly once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-07-30T20:11:46.469Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a6c6cef9c2644c7f89ec054
Added to database: 07/31/2026, 09:37:51 UTC
Last enriched: 07/31/2026, 13:03:28 UTC
Last updated: 09/14/2026, 10:01:29 UTC
Views: 49
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